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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7724b66c3e7ccc886272ebbd46956cabf31aa5697aec2312d28fce86f214db1e' 
  AND token = 'II1Ivx77B52VqueL1hIWGOHGE7Y8/8SsvTrvURYjLho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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