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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2404158dc8e112b31d74008bc7d6fb9be1857a4b0c45d7c0375ec5534925a594' 
  AND token = 'fzJcXozRa5ArJfXNP6dimUX899NBlVAN/rqKxmOZMm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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