SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5593208f2645c6332ecdc893263b5a1cee31ea1c5751efcf2dbcab6fe94c3a5e' 
  AND token = 'nwM9v1chYloirjMxB8S/UTPvPfqYqRYsCIVj/VFD4zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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