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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2af5c24c3834bbcf452cece774f93a1c869963d2a635f69d991a41d51764d11' 
  AND token = '6mx9qO92tspnaEtGyDJsqybKiUW1kWDF489jwQcNUFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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