SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a22fb0010f67445a483a1202a1da6e078dc4cfa805e7bc79a2ede588f94d6131' 
  AND token = 'koez0+YQwI9P/RlDVoJpABX7MLWPOJhm/Opf3zIbIRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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