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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cef3f75edd1d06044eeaf8013ecf31e70608d0ecdf7d8e0edfb1f732183be8' 
  AND token = '9Hj+tq7YdLW5TjVQLb6LhhHAItcOuRMmNtRHt2wabLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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