SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72d6fe10d49d44be1f3bf2b3d89fe259c3a61ffe4b6a3530c36468fd196f367' 
  AND token = 'NTA8FwFTIwSsbpKVQxrLm8jXYGgJ8DyrLtJJFjS0Hnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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