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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c9868cf0055a7fc6ce445d8f3dc09ab51bd56c9328d02f24058c009dc9eff5' 
  AND token = 'RexArOuUQtB9IxrvutALNSgqIpPl3J6KxGsM6AxFEnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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