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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e437b76b6e05bbd96a370c8ef85279468770d2ff1a7719eb6e6320d4eca8b5' 
  AND token = 'Ze3rjMyvpRQZe52fAtkGyvnrT1HlxjgqB2cXc3McSno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}