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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c9f43438a88e6106cc22838eb9ef480e1a6b77627bbc676ec43cde8415cfe0' 
  AND token = 'ddKHqZZphoL+1k+Iz9OfM0Yl9rh5m4d5UUz/QeOm3BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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