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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a760c59f6330f1f6c33bef53efbfa9cb805d108857cb30b703427eb5f07666f' 
  AND token = 'iSYA4k6Gy3jwQhUU5k1k8gY8Gfqt9anHj18lvd2lDCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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