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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae720b197ede1e03f332af80cb30a21f22030aec5ee8904054a1b9859b03f4e1' 
  AND token = 'bYcxuhi0oSFmvhYDWjnY8lsduf7Ao3tXipzc8cslCnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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