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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd0d181c22dfd5ec763b95c0131a3007a4b5e968d561f53ac0f25392544d9c7' 
  AND token = '2WIuu78u4BtSTjbtE6yJGqQo0tdu2Vhfkl3ZQYqvGdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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