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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24f984fea09c1549adcd9ff658344666b31954092e0d58e9ef21a870895b476' 
  AND token = 'lwnie/4h8q3RU5rwdHvFx4h7Yy9zcenWRNYouBNsJRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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