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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59abf5c45ed29a9c535442b669ee9316e49d20342b1f529df0545e5293c4772' 
  AND token = '286IN3lt7cMn1s6QrlhOIiJ8UKtxkm26jskgmRr7J/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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