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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6ac1a511c69e3757390b4bac5f17b32f103f58eaef0810bc34cdd21ff3105b' 
  AND token = 'NaXK24pZup9aUiwRnBdUWXvb2x/1PhIl0QXx+CI4jFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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