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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd4f9b6d597cb5587fb82277323dc911ebec5b09079d05e1de8bc5e28ef2e22' 
  AND token = 'CwA4AO09Tqf72kUQChJkmvcLPO5hbzLl2BAaxIsmmOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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