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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a26f82d054f9d68acf6ecd29a37f5e8c59c2274d73d6d479be841273d9c6354' 
  AND token = '7dqxarglUabxsWGHCleqUwLLiNZGDays/rSptztM3dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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