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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab798873ca6444ac586c8f18871493b6f1545e48f313f1a5451ef57647219319' 
  AND token = 'YcWkDsI9eHcep8iyw1i7CnaPzhwC36p3dKhtm9VRegw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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