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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988f782edbef0e94bd3ce99390e3d2672922f07a07b4a013c86333ec7bf2b829' 
  AND token = 'ykyxd+QqSc8qDQlju2ibUC9nGNvf/jbUyec5Da2OWqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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