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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e63577cd13d66185448561588daa34805a6156e00379ebf9e2565a981f6f65b' 
  AND token = 'QV8bg1jsDkOJMl4axraavUdZOx7Wt0N1dzwPgh56FDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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