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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3455afccacf8a92dd4f87f37a998cb6860d40ec44bd5d3ed54af7751f9f5f4a3' 
  AND token = 'UQauzFU+vJvpvTvuFwyt/TzWhWacw7DWbG3nyNwVQdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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