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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9972d00e315c954463727c0eca175806245c8cf7901023eb426dcb6653e48f6d' 
  AND token = 'aaSHiBa4g62YAuIU3B216dPUZcgROTRHPT/2IA+0ZTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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