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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee61545bff2f1c9de72b815148a929ea55c031c8eec1d24063eae6b612d80bf2' 
  AND token = 'QYUHk1IbeegJe5b4qeRcoAhicpRzamF2jC6n3IpXAW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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