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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56f079ba889cb37906a90f4efd139d7b8157e3c8c4f60cc284c64cc311b1fc6' 
  AND token = '43AG/RCJSaVIMblArep19ZFpIhL3wUAL+NAEjXfHxKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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