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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5691877455995169bb415f782c2af0c205067ec5307a5d5cdc565f79ba316b7b' 
  AND token = 'NflNxgJFixj/lc8+m3k5RR0e5cKo6CU4GNAbNQV5Fo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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