SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb1614a54bf91a5ccb5550070c478acac3b7e38d1c6a38a9eab97646a6a2aac' 
  AND token = 'tJZt3KuhenbN/2NTrGkOGAaEOBnR7wuE458wNlt5RrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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