SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01dc98c5e297192e3cba77b76d665876b3653099396248fa37d3a676dc5012c1' 
  AND token = 'WnzQRC/fBXm3TDs3EU93T/KJcBqHY43uwtsXKj6AvJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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