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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '130626dd1e51925fb380551e0aa8a0a6b244000a82c35e3eeb050f7e640d1c84' 
  AND token = 'gaMCkY725kekgyMH9cbuQ33hb4qzP/W2Xu8g4DHOsPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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