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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '916012ef5757b751f2f1deab77e739eb9c1455a178c81e42e8de10af7ffe7139' 
  AND token = 'arRfaeumBQo6PNJjuNl13jwh/8gkXLSAlAxrMpk74eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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