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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7413da749417e90df0c04291a8ac58ac36f897e241b97437a829ef06eec43016' 
  AND token = 'pLLXHAKcMwx4L58PxLFs1iDjOe3mNMWrq/B3mAp/t2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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