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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4738edc179361b289a6f3e7da0cd535e8ae5fc9e945735a3322dedac320558ec' 
  AND token = 'KhacUYuB8eityVzzkqsVFaI3dhtTxrxzdBELcWVrNOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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