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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '265cfc9bef139bf0871270b7298373109757e364390d09ceb14aefadb6613394' 
  AND token = '0rA+W2DxRG2oC0rq+6xdrR6fmqprjkR54a9o+alpl/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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