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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad42d65b09301c21e94b1d61360b0b916a9c7ce3ca5b031833a585ed786a23b' 
  AND token = 'fgw7MevcsVUafmSQ5ZvdKiQDiIv2fD93RYzLIE6JMr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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