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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5bb87ab722b553ac01ed5d0a210a63a3d5f4f4cec681dde88cef5063562c12' 
  AND token = '8wrT5YQweQXAapE6wD1Yb1nbFm0zNq6QIzlKngqycAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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