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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab682d8a3e8ac158dfb08044ef724cb90abfb7d7905ad28142835bd4d3c0fad7' 
  AND token = 'MQnxKk2sSy+P7wH84qefscO7nrGjV9IrehZh0pahRCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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