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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cceb60005dcca0221be1eb72b16eb501f9a36805dc6111e1c0d9a0def2be14cd' 
  AND token = 'Zbvwh7louUhmfrGyqKkKaQ887UQ+YYhKPrfAevzhYNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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