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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9afe32835457082586b6a80524beccd4f78b857eac0b839ebb3bd36018af61' 
  AND token = 'Xl6WiuvYcS8Fn1/2H0Xi4Fau70I/T69iunCmcJLDj6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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