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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5d966ffac70aff142c3caeee8a5ed095273c0c69753bcb25762e05069d8df6' 
  AND token = '9QPN7kclZg3MYZi5tQ8W4Cipzdq8yEFIF6cQnE7FOt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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