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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1987e81d5652d8eab9accc63a5217b135aeb928d8e56d7fb530ec5f2b5a25a8c' 
  AND token = 'AR49a0IFjtUH6K9dIzGxu+YlkIqNMufrgnQziam10Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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