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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79f8006842fa80c94990b2f564e29f17995fc536dc04dc3248275aae32fa49f' 
  AND token = 'XDyMp6flgOqnYa0JgqSj6fXgSMDDpb4EXhVvFGH9+4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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