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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf0c14a88cf5c225561b4333b2c0f9018a8d1a7ddf947b5606eda0348e448eb' 
  AND token = '7+UlIqph7bm16WFRksYdSXahttzthAds7eowotaxBKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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