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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84de97f09119d9e979339af3b5722391e289911586f8daac113246732407c97' 
  AND token = 'XFCpvqdXKuLQPP7s0BlMRDkqlP4Mr43LEIykWjkfcck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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