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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd71e21d27da528c82fe1fccc236b73a255484b8a8bbac55e5b70e9eaaffebd' 
  AND token = 'Jd7yYtL7cXbQ67b1gZ3C/k58LF4mNJGZ0Y9MlEtAk1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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