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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f616cda1df891bdf3c9ad5c6fdfc5cff3bbe6da4cd8b8ee58a25e0e1c44d35ec' 
  AND token = 'XgUD4KwFE9/nDt5g0eamiQGVFhmZi9bp46IgT9xgECs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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