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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f9ceb53ba8521db08e48d6fc3d7f6d107c5298529a3de9ae5e8a29a1c217d6' 
  AND token = '03K5FFFgp07WsJl+mrLA32bG5wIB8rDWRuwdY/RFyvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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