SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768da63f5a91428d6f3f78b627e5d5bfb092875361d76f0112b91ee0edcbfb70' 
  AND token = 'gOS/ZA95nLeq0KvPJV4/YjlXjozLorKUQK4SL55/wBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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