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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3434abd63d8d96dfbcdaaec98a73c689a699648a49e6ee12c30b50c41211c2ac' 
  AND token = '/YA8dQ2yWaxSW5cDF6IIfSxaze8Yx9oyqW0LlXbw2HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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