SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa30ef74d23ca94b0f57983c31c557ab5474839e3c4db2d06fc2c962f2dd9035' 
  AND token = 'YqohJmO/ZQAMQOJoMiCEVbbKL5KFaAFLKOZgIk3rnnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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