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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '522244450142917401f5753608872f91006a08fa083c7f3b0b9aa55190a7d5df' 
  AND token = '7jA5fOAxPsGSLbtDdGsYhIYdFe246AFoQkSGjwH47aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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