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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef52df2146c58f7f1d86f0ca228adf2251714b5eabe04b7fc4a2757ab5b3348' 
  AND token = '1hbZ3tMy5UAzQ8X6fB2iMVCeg1og2IMuKPudX/YTbE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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