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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10392f3c104e203103979ea06cf252f234cd48d56c0e70f6baf3b416a3c3ec4e' 
  AND token = '6Y0roATVYFLTaykDNZoUNQ/bheXHA72bEu9/qjtzDmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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