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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5015ae168959b22e5cc3e1ee25fa1746def118a17d2528588ef0d03e1ba889' 
  AND token = 'kGA2If4ogwMPjlqjRIolrhn4pzyMdqnboTcAPLTD6uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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