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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa8f950034d85eee2e8041e8f416a9cd80b3067793cea2dc69e9a5f29533078' 
  AND token = 'C/SNNwtwY+nDBFb7EaciRi6dfc9PbChxt3u2VP/kUQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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