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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a05422e16ff475b6ba991fd3791b3adb61c3958548a5283abb6fc808137c031' 
  AND token = 'WThR61Sh4t4XkY049LzzrCcApfxV4+eqsSWoBK/+zoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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