SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9266ce2308a7b04e3c74627b39f7c8b6f0051fdd2ad9ffc1c915f7fff7a3a90c' 
  AND token = 'ZbFNnwedGYgoqul3wSHNnX9+Vpy+2BuGG0RLZNvruIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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