SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3421d2543ad53d635d581f8a59f2f7ffbf4804d55c975188d4817b74e3e6525d' 
  AND token = 'qDZrhX9m30bphpY/w4Dq7MUc0VBCJ0mS/RvWjXVuh3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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