SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787d4bda429fcb1ada34255f41f6cc73d688d35292861ef4efe513f66b5ebe5c' 
  AND token = 'wvC7QgX86PwG2KbqjIlnYCDnCnz5t5vXSx8znvyCgTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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