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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef040f9a93e18bad55eb475d9be0394cd0419cecccd1559b78ba5e3ef2f1441' 
  AND token = 'BcK8Z6xjO7eRROdJg9ywAjZPDdGiD/9btzZmMMgKzXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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