SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e338a9b194a41642960fc67e66665e9a7f3efd5094a9c811507c26b7d69cb0' 
  AND token = '+g4fV5UPFqlliJ4PML10Dh+Oxwz5+jT+s7yS7tOBrXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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