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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e87a8e1d87a3121654a5358ee65af4ecd57903c076293c95f97a19762f7ed53' 
  AND token = 'QBADnnWasrrJkF8efVYShNldA/ilO4NwbKvju28ocwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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