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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b2edef775a44dff46583fabd6d2510892d6260fb2b623b6992210fc19d2dae' 
  AND token = 'oXe7GzowWc207YlKs5oWT8DIrjf9/6IL0ffmXEDG+R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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