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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53aa1f34d08184039c47d406fcfa63d63f78b315c27bb7b54a937a8d08044dcf' 
  AND token = '/W67Pn3HJNkdMCEolF1GXIc9SWyZGVZYodCQZOzqaEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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