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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a8814ec3ca7766efa098820ca92bcb3b83094f1ac700912384da561f596c61' 
  AND token = 'Y/pNz6Yqf3O2St4jFRdkO3Dl2vKkUK389qXeMo1XTFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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