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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e251177fa6b12d04cae09ed3a1f6b8a5629c5a896419c959e4f4701b5a15d527' 
  AND token = 'lEaVTlSbBcWrN21H6BApMI+7XrwjXHkRGoOxINz7wB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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