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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d42c3beafd97143a4c577bdc9615ae38c4cfc6c25a214c8d14d42ca97899add' 
  AND token = '3Yd0xEAX4CYhKlt70U+Md33EMZsg7othnvFSI7DX6qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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