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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9751ab16dcfcd6a5988bb25059118ead486de1ed521409e525f8b20a508326' 
  AND token = '67ciQMfKdr6K92yBOYXyYYIYLw1k6QjwUKW+eYe7IXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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