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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda9a37b15e6394a5c63f25972283cb6bec52380184dc0f5f28f3f4347a3b238' 
  AND token = 'aGOloKmwxxXftvQmzOFM8mXWWSOCR1j1K4czXfup0dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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