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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284a040ae938301fac93e9e6d988a068fb6bd54bf10d7048bbb5ec0a8ae03276' 
  AND token = '00/AewI1bd9a3UpA+Wg6iQtCjtEaFFtREkmndl4IgzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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