SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13c666a30628b9e140e09d5ab6a877a79d4e04dd51ac6b8b258c5dd4451a139' 
  AND token = '2TjjdeomuMultvfRQIsV/dh4HnPODfFu3ZZJIaGHBJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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