SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f5ad3331793c096de5546cd22bf1eddf7fe69051748c43f814f7830bdb68df' 
  AND token = 'hJZehXQC6UGF8whC2NEVbyGyoKYJZ3xL9lZZI4XbcmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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