SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f72090139641192d6a3b235c449befc854d0b1c26a7f06b989dcdf631d2725' 
  AND token = '+Myo4AlK7vovw7iwmlVrPH/9SihOXmRsqro3v0wIzeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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