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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c65394904fbd8e4af7eefd77cfb9ce619e3ef9fc0407af19b1438abb9340d87' 
  AND token = 'rGZ94kqyXaxngd68qAJurRJ5Z6SmW0i95e3xwkfJbuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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