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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af474a6ed9b5472e9b1a96d21fe952ba7a38158ad8878e5f7e05116a29c606e' 
  AND token = 'mZoel47ZMPP1L/rOjrLOZYNfDm26lKcuv776+8yS8qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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