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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a21d9884e2850f87221c673a815e98fdb8aa5fbf79a7e54f1c540d9ed69cb0d7' 
  AND token = 'DHkn6C4ykETUQh0/+EzEcfkCzKO1hQX+L+VJRUbkSTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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