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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305fb5a57a0a8fb4281b4e882901ba987b3efc54b5a1aa01c2f4703613479bd5' 
  AND token = 'uRPnCsLfqa1rcz05o0XWD+HadSTODHrIgHWxlFzVpdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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