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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67039e0366f6da73ee3c151d268aaed5f287ab67be9414809be887397ba843ff' 
  AND token = '4do1Ovy7YZgYoa32fi+PkSlOOG3zmMs7gaVXbTVxwug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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