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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31f5301ea6080fcdc20418477ba121ef8b23f75b2194777766d37c6526e9ca3' 
  AND token = '63XFkUBlH9PZjDlBhk2rMjXE2XLRC35194Ug+IveyN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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