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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e896b88aed0efd64cac12dda2260aaf41e15f4bbf0afb23a89e193aa96da666d' 
  AND token = 'R519GzGEw4fVBEhHGVcxXAn88z7wWpMLM5RysD60A58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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