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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b40ce58815ba7e7f871160a9ed0f8a0933619048466bae9837cb7e28877cb47' 
  AND token = '1HyXrc3W58OXS7uBQDqdWk5iqi4qG+SrKYOUFzZYLDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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