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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f876c5696a4c1c4a757c69830fa2ddb218622f533e39be6d5d8a1b19035207fb' 
  AND token = 'aS7aYAYpdqxcUj1ohAi3ZwQ3rR4+httmC+glTOj0N5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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