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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db632d9eb8273061ca9e8820e237a248120471f02ff3a321bab1a69aec2ec54' 
  AND token = 'NkNWuIjBT0h5+UMLCO8OpoC+NRSF68o0JlrSSmrKjvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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