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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7af96cf30a4306406d0fd5554d241220ed4862c17607c64d9cf7ae6638991e' 
  AND token = 'kDMIQn7WzveSsUffs79Ibkp/g7JP4VoddyJMbzpo1cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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