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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd8cd31809d8e5d5a2924e9cb43d7acb6f70e08bfa29b4d5fd05e606b77523d' 
  AND token = 'ZwK5Rev9rT+5ja6l8zc2nyDjsylBeDHl9pZ+WcQ34i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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