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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfefabcf6b65f6e72cc4f3cf0c1e7719658082901629edc97c2b8a4b5bb403b' 
  AND token = 'XugIq1hoUv00ILRKNVH/FNqexAGQJEoKM24VOEXhna0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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