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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d8b3f082635b2bb2f65939c652bc0fa9e4e2bb7e2800bc0a821e8daf4775da' 
  AND token = 'K2dmBNWQ+EI0QfawOt7pNz6dIPNlCRszZXoQJ6azSVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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