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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928bfda3f9115444ab9619014d65dfa84716642453cc3667f7bc461ca8a12d25' 
  AND token = '897wpbaP02sAIlqK0Bk9RZOuwQEhuY8y8v7bygDbus8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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