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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11da92aae0b6af244affa01cadfcc02285d9bf4d03295c923974aa641d3dee1' 
  AND token = '3D/OK17Ot/L4b9TJ+Ap+YK43Yq3H7XBm0POmmJ+5/PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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